.040 intake p/v too tight?
#1500639
09/12/13 09:59 PM
09/12/13 09:59 PM
|
Joined: Oct 2005
Posts: 312 illinois
dodgeram1998
OP
enthusiast
|
OP
enthusiast
Joined: Oct 2005
Posts: 312
illinois
|
#1 Piston, all valve train mocked up, lash 0.0 , dial indicator mounted on intake rocker, roll over to TDC on the intake stroke, push down on rocker .078 movement, 5 degrees after TDC .041 clearance, 10 degrees after TDC .039 clearance, Exhaust valve P/V clearance minimum at 10 BTDC IS .108 I don't remember if I put this 278@.050 roller cam in straight up or advanced but it looks like retarding it would not be a option with the .108 clearance. 440ci .060 over steel rod .040 HEAD gasket looking for fixes LOL (piston valve notches). or run it BB- BOOOOMM?? anyone run .040 P/V intake clearance? I think the exhaust will suffice Thanks
|
|
|
Re: .040 intake p/v too tight?
[Re: dodgeram1998]
#1500647
09/13/13 08:15 AM
09/13/13 08:15 AM
|
Joined: Dec 2009
Posts: 20,647 in a cattle trailer down by th...
Guitar Jones
Paddle faster! I hear banjo music!
|
Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 20,647
in a cattle trailer down by th...
|
I think with the lash set you'll be ok, you could retard the cam 2* and see what you get. I have run as little as .080 on the exhaust and .068 on the intake without a problem in my small block.
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion. '74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost conversion. 2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
|
|
|
Re: .040 intake p/v too tight?
[Re: LSP]
#1500648
09/13/13 08:24 AM
09/13/13 08:24 AM
|
Joined: Jan 2003
Posts: 1,784 PA
W5DART66
top fuel
|
top fuel
Joined: Jan 2003
Posts: 1,784
PA
|
Quote:
You'll have a good bit more P to V than that (likely .020"-.030") with actual springs on it.
^^^^^^^ this
Check with real springs.
What heads, rocker set up?
If its mopar single shaft deal it will be like .050" more plus your lash.
|
|
|
Re: .040 intake p/v too tight?
[Re: W5DART66]
#1500649
09/13/13 08:35 AM
09/13/13 08:35 AM
|
Joined: Jan 2003
Posts: 10,012 Frostbitefalls MN (Rocky&Bullw...
gregsdart
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 10,012
Frostbitefalls MN (Rocky&Bullw...
|
You should see another .010 from adding the springs you will run and adding the lash in should get you to about .07+? I have run .050, but the pistons didn't let carbon build up where the valves brushed them, and that was a 6200 rpm stroker. So, I would look for at least .075 to err on the safe side. The really tough one is the exhaust. Don't go below the suggested minimum there, as the valve is closing when the piston is close and if there is any valve train issues you will have contact a lot earlier.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
|
|
|
Re: .040 intake p/v too tight?
[Re: B1MAXX]
#1500655
09/13/13 05:53 PM
09/13/13 05:53 PM
|
Joined: Nov 2010
Posts: 1,397 Carson City, Nevada
Biginchmopar
pro stock
|
pro stock
Joined: Nov 2010
Posts: 1,397
Carson City, Nevada
|
Like the rest, the first thing you should do is degree the cam then check P to V. If it is close with '0' lash, under .080" with the gasket, the pistons need a deeper notch. Do it right the first time or you will have to do it right later anyways with more expence of broken parts.
|
|
|
Re: .040 intake p/v too tight?
[Re: dvw]
#1500658
09/14/13 10:48 PM
09/14/13 10:48 PM
|
Joined: Feb 2005
Posts: 4,318 Prospect, PA
BSB67
master
|
master
Joined: Feb 2005
Posts: 4,318
Prospect, PA
|
Quote:
I wouldn't be afraid of .040" with checking spring and zero lash. You are going to gain from deflection,spring pressure and lash. If you're worried install one of your springs and lash it. That removes all guessing. Doug
|
|
|
|
|